1221212011222 has 8 divisors (see below), whose sum is σ = 2093506304976. Its totient is φ = 523376576232.

The previous prime is 1221212011157. The next prime is 1221212011259. The reversal of 1221212011222 is 2221102121221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1221212011222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43614714673 + ... + 43614714700.

It is an arithmetic number, because the mean of its divisors is an integer number (261688288122).

Almost surely, 2^{1221212011222} is an apocalyptic number.

1221212011222 is a deficient number, since it is larger than the sum of its proper divisors (872294293754).

1221212011222 is an equidigital number, since it uses as much as digits as its factorization.

1221212011222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87229429382.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 1221212011222 its reverse (2221102121221), we get a palindrome (3442314132443).

The spelling of 1221212011222 in words is "one trillion, two hundred twenty-one billion, two hundred twelve million, eleven thousand, two hundred twenty-two".